Hello there, @sunshine071080.
The Reviewed tab on the banking section in QuickBooks Online won't be cleaned since all matched entries will continuously add up in this area when managing your bank transactions.
To learn more on how the banking page in QuickBooks works together with its tabs functions, please see these great resources:
I got you covered if you have any other questions. Just let me know by leaving a reply below. Wishing you and your business continued success!